Evaporator



P 12, 1933- F. G. SLAGEL 4 1,926,461

EVAPORATOR Filed Aug; 13, 1930 31 2b 14 I V .15 H C L I j 11 .f 10 f j L as g9 is I Patented Sept. 12, 1933 UNITE STATES PATENT oFFlCE 1,926,461 V EvAPoRAToR Franklin G. Slagel, BuffalofN YV., assignor to Fedders Manufacturing Company, Inc., Buffalo, N. Y., a corporation of New York Application August is, 1936. Serial Nb. 475,030

Claims.

This invention relates to mechanical refrigerating apparatus and more particularly to evap Still another object of the invention is to provide an evaporator in which a minimum number of tubes are bent and associated with a header to form a freezing chamber open at only one end for the insertion of trays.

Other objects of the invention will appear from the following description taken in connection with the drawing, which forms a part of the specification, and in which:

Fig. 1 is a side elevational view of an evaporator, the header being partially broken away.

Fig. 2 is a front elevational view of the same.

Fig. 3 is a view looking at the bottom of the evaporator. r V

Referring now to the drawing by characters of reference, represents the headerof the evaporator which is preferably formed of sheet metal formed as a cylinder and open at the front end. An end plate 11 seals the open end of the header, and provides the support for control mechanism, within the header, as well as for the refrigerant conduits.

As a means of conducting gasified refrigerant and oil from the header, a tube 12 extends into an outlet opening 13 in the end plate, and a union 14 is secured to the end plate in communication with the opening. The conduit 15 extends from the union to the compressor (not shown) A union 16 is secured to the end plate and com municates with an opening 17 through the plate,

, a conduit 18 extending from this union to the condenser (not shown).

Arranged in the opening 17 is an apertured seat member 19 with which the needle valve 20 is associated, such valve being type. Liquid refrigerant and oil, either partly or wholly in solution enter the header, where the (Cl. 62-126) f valve 20 is unseated by the movement of the float when its position is loweredby evaporation of the refrigerant in the header such that the levelof the accumulation is below a predetermined level.

of incoming refrigerant when the accumulation Thefloat rises with theaccumula- 6O 7 tion and will cause the valve to. shut off the flow reaches the desired quantity. Oil-and gasified refrigerant move into the open float in the same relative quantity as admitted to the header, and are removed by compressor suction through the outlet tube.

In order to increase the heat transfer surface and to form an ice making chamber, I provide tubes 23, 24 and 25 having their open endscommunicatingwith the interior of the header and projecting through a small area at the rear end 7 thereof. The tubes 23 and 24 aresimilar. and extend in a vertical plane, one depending from each side of the header; The tubes are formed with parallel legs 26 and 27. extending from the rear sides of the header, the legs 26 extending well below the legs 2'7, and the portion 28 therebetween being bent to form a plurality of loops The tube extending longitudinally of the header. 25 includes two spaced vertical legs 29 which depend from the rear end of the header and below and 27 The portion 30 of the tube 25, intermewith the header.v The three tubes bound a space below the header which is open 'atthe front end and thus provide achamber for receiving pans of water to be frozen. V

A sleeve 31 is arranged Within the tubes, preferably in intimate contacttherewith, and bosses 32 are formed on the interior facesof the sleeves to serve as supports for thetrays33. A plate 34 is carried by the bosses to support one of the trays. The rate of heat transfer provided by this arrangement of tubing and sleeve, insures the" water being rapidly frozen. The tubes also serve to transfer heat from'air circulatingfpast the exterior of the tube structure.

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible of numerous other applications which will readily occur to persons skilled in the art, and the invention is therefore to be limited only as indicated by the scope of the appended claims.

What I claim is:,

1. In an evaporator, a header, means for automatically maintaining a quantity of liquid refrigthe tubes 23 and 24 and intermediate the legs 26 diate the legs 29, is bent at an angle and in the form of a plurality of loops which lie parallel erant in the header, and a tube depending from one end of the header and having an intermediate portion formed in loops arranged in a horizontal plane and extending parallel and longitudinally of the header, the ends of said tubebeing in communication with the liquid in the header. we

2. In an evaporator, a header, means for auto- "matically maintaining a quantity of liquid refrigformed in loops arranged in a horizontal plane Y and extending parallel and longitudinally of the header, the ends of the tubes being secured to the header in communication with the liquid in the header.

' 3. In an evaporator, a header, means for automatically maintaining a quantity of liquid refrigerant in the header, a tube depending from each side of the header and bent to form loops extending longitudinally'in spaced relation of the headerv to form a freezing chamber, and a tube depending from-one end of the header and bent to form a horizontal loop extending parallel and longitudinally of the header, andadj acent said longitudinally extending loops. a

91. In an evaporator, a header, means for automatically maintaining a quantity of liquid refrigerant in the header, a tube depending from each side of the header and bent to form loops extending longitudinally'in spaced relation of the header to form a freezing chamber, and a tube depending from one end of the header and bent tion with therefrigerant therein.

5. 'In an evaporator, a header, means for maintaining automatically a quantity of refrigerant in the header, a rectilinear shell having a back wall and an open front, said shell disposed below the header to provide a freezing receptacle, and tubemeans mounted on and covering a major portion of the side and back Walls of the shell and having a horizontal loop portion engaging the bottom wall of the shell, said tube means being in communication with the refrigerant in said header. 7

FRANKLIN G. SLAGEL. 

